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	//队列是先进先出的数据结构
	//队列的实现：用push()从数组后面添加项，用shift()从数组前面删除项
	var arr=[1,2,3];
	console.log(arr.unshift(4));//ie7,ie6返回undefined
	
	console.log(arr.pop());//3
	
	console.log(arr);//[4, 1, 2]
	
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